Since I upgraded to Windows 10 Home from Windows 7, I've noticed that from a cold boot - e.g. PC has been turned off for several hours, the Ethernet network icon has the red X through it and I dont get any internet/network access.

It reports that the cable is unplugged. It definitely is plugged in, it goes straight into a Netgear Powerline homeplug.

If I then reboot, it connects straight away no problem at all.

I havent installed the motherboards LAN drivers, but thought it might be something else before I tried that?